I had tried dt powder coating with hf red using a Glad "to-go" container with rather poor results. It would take 2 coats to get decent coverage.
Today I cast up some Lee 225 tltc and tumbled using a cottage cheese tub. One coat, cooked 400 deg. for 15 minutes on non stick alum foil, wow...smooth finish... done deal.
#5 plastic made ALL the difference.
Thanks for the heads up!